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Date: Mon, 24 Oct 2011 20:38:26 -0700
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Subject: Re: determining bus_dma memory usage by driver
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On 10/24/2011 5:21 PM, Chuck Tuffli wrote:
> Is there an easy way to determine the amount of bus_dma memory
> allocated by a driver? Something similar to vmstat -m
>

bus_dma memory allocations are platform specific. Looking at least amd64 
you can see that the memory is carved out M_DEVBUF.